Apparatus and method for imparting false twist to a yarn
AssigneeThe Hong Kong Polytechnic University
InventorsXiaoming TAO, Rong YIN
Life of this patent
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Abstract
An apparatus for imparting false twist to a staple yarn comprising a yarn guide for guiding a staple yarn along a path and a false twist device comprising a convex surface for engagement with a staple yarn so as to impart a force to the staple yarn when the staple yarn engages with and traverses the convex surface of the false twist device, and wherein the relative positioning between the yarn guide and the convex surface of the false twist device is adjustable such that, when a staple yarn is engaged with the convex surface of the false twist device and extends between the yarn guide and the false twist device, the amount of contact between the staple yarn and the convex surface of the false twist device can be controlled.
Claims20
An apparatus for imparting false twist to a yarn comprising a yarn guide for guiding a yarn along a path and a false twist device comprising a convex surface for engagement with a yarn so as to impart a force to the yarn when the yarn engages with and traverses the convex surface of the false twist device, and wherein the relative positioning between the yarn guide and the convex surface of the false twist device is adjustable such that, when a yarn is engaged with the convex surface of the false twist device and extends between the yarn guide and the false twist device, the amount of contact between the yarn and the convex surface of the false twist device can be controlled.
An apparatus for producing yarns comprising
- a yarn guide for guiding a yarn along a path,
- a false twist device comprising a convex surface for engagement with a yarn so as to impart a force to the yarn when the yarn engages with and traverses the convex surface of the false twist device,
- a first front drafting roller and a second front drafting roller together arranged to deliver a yarn to the yarn guide and false twist device, the first front drafting roller arranged beneath the second front drafting roller,
- wherein the relative positioning between the yarn guide and the convex surface of the false twist device is adjustable such that, when a staple yarn is engaged with the convex surface of the false twist device and extends between the yarn guide and the false twist device, the amount of contact between the staple yarn and the convex surface of the false twist device can be controlled.
A method of imparting false twist to a yarn comprising the steps of
- guiding a yarn along a path by a yarn guide,
- bringing the yarn into contact with a convex surface of a false twist device,
- moving the convex surface of the false twist device relative to the yarn so as to impart a force to the yarn and produce a false twist in the yarn,
- and adjusting the position of the convex surface of the false twist device relative to the yarn guide so as to control the amount of contact between the yarn and the convex surface of the false twist device.
Dependencies are inferred from the claim text.